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2. How can you connect all 9 points without lifting your pencil and using only 1 straight line?
Get a pen and some paper and copy the nine dots arranged in a square below. To solve the problem, you need to join all nine dots by drawing no more than four straight lines. The straight lines must be continuous, you must not lift your pen from the paper once you start drawing.
How can you connect all 9 points without lifting your pencil and using only 1 straight line?
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